Possible cause of failure:
Customer stated it had a catastrophic rear bearing failure.
Rear bearing journal is undersized by -4/-7 microns (iso is +/- 5) with fretting
Taper is pock marked
Drawbar was wet with coolant, rotory union apppears to have been leaking
Clean, inspect overall dimensions.
Grind chrome plate and regrind 85mm rear journal.
Kiss grind the taper
Customer to replace rotory union
Adjust preload, balance, assemble and break in. Final quality control inspection.
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Catastrophic bearing failure was the main cause of this spindle malfunction
Continue reading to learn how Northland Tool performed this repair and converted a Weiss GHK 176239 spindle from grease-injected to permanent grease lubrication…